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Discontinued Operations - Schedule of Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues	$ 1,915	$ 4,105	$ 6,676	$ 7,815
Gross profit (loss)	782	1,669	2,413	2,911
Net loss	2,342	(3,176)	(684)	(6,110)
Net loss attributable to acorn energy inc.	2,436	(3,149)	(539)	(5,918)
GridSense [Member] | Discontinued Operations [Member]
Revenues	64	702	207	1,610
Gross profit (loss)	53	(4)	23	273
Net loss	$ (224)	(1,600)	$ (1,610)	(2,069)
U.S. Seismic Systems, Inc [Member] | Discontinued Operations [Member]
Revenues		79		79
Gross profit (loss)		4		(86)
Net loss		(229)		(1,381)
Net loss attributable to non-controlling interests		31		175
Net loss attributable to acorn energy inc.		$ (198)		$ (1,206)

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